Hinge plate recessing device



June 25, 1968 J. MACALA HINGE PLATE RECESSING DEVICE United StatesPatent O 3,389,729 HINGE PLATE RECESSING DEVICE John Macala, Box 111,Kamsack, Saskatchewan, Canada Filed' Jan. 10, 1966, Ser. No. 519,713 1Claim. (Cl. 14S-60.5)

ABSTRACT F THE DISCLOSURE A casing containing a slidable frame whichcarries a set of geared together shafts equipped with cutters. Thecasing has a bottom Wall with an opening through which the cutters areprojected to an operative position when the frame is lowered in thecasing, the frame being biased upwardly by springs. Adjustable stopelements on the frame are engageable with the bottom wall of the casingto limit the extent of projection of the cutters from the casing whenthe frame is lowered.

My invention relates to new and useful improvements in hinge platedrills.

Normal hinge plates used on doors and the like comprise a pair ofsubstantially rectangular plates hinged together. It is conventional torecess these hinge plates, one upon the door edge and the other upon thedoor jamb so that the surfaces of the hinge plates are liush with thewood surfaces.

It is usual to chisel out the rectangular recess of a predetermineddepth controlled by the thickness of the hinge plates and then to setthe hinge plates within this recess. However, it will he appreciatedthat it is difficult to chisel out these rectangular recesses and toobtain a relatively even depth without some considerable time and carebeing expended.

I have overcome these disadvantages attendent upon the fitting ofconventional hinges by providing a hinge plate which is curved at theends and also which may be curved along one edge thereof, said curveshaving a fixed radius equal to the radius of action of the drill machineused.

By a provision of these novel hinge plates, I can utilize a multipledrill assembly to drill a plurality of overlapping, partially circularrecesses within the edge of the door or door jamb, said recesses havinga predetermined set depth. The drilling device may be powered by a handdrill, an electric drill, or an integral source of power as desired.

Therefore in setting the hinge plates, all that is necessary is to applythe drill assembly to the door edge or door jamb, rotate the drill andpress downwardly until the limit controlled by the device is reached,whereupon the hinge plate may be set in and screwed to the door jamb anddoor edge thus saving many hours of labour in the fitting of a door to adoor frame.

The principal object and essence of the device is therefore to provide adrilling assembly of the character herewithin described which enables aplurality of overlapping partially circular recesses to be formed withina door edge or door jamb, the contours of which are equal to thecontours of the hinge plates.

Another object of the invention is to provide a device of the characterherewithin described in which the recesses are positioned correctly withreference to the edge of the door or the door jamb thus eliminating anymeasurement prior to drilling.

Yet another object of the invention is to provide a device of thecharacter herewithin described in which the depth of penetration of thedrill may be controlled to suit the varying thicknesses of hingesnormally used.

Still a further object of the invention is to provide a device of thecharacter herewithin described in which the drill bits are normally inthe uppermost position until pressure is applied against the device thusmaking the device safe in use.

3,339,729 Patented June 25, 1968 ice With the foregoing in view, and allthose objects, purposes, or advantages which may become apparent fromconsideration of this disclosure and specification, the presentinvention consists of the inventive concept embodied in the method,process, construction, arrangement of parts, or new use of the same, asherein particularly exemplified in one or more specific embodiments ofsuch concept, reference being had to the accompanying figures in which:

FIGURE l is a plan view of one configuration of hinge plate used with mydevice.

FIGURE 2 is a plan view of an alternate contiguration of hinge platewhich may be used with my device.

FlGURE 3 is an end view of the device.

FIGURE 4 is a front view thereof.

FIGURE 5 is an underside view thereof.

FGURE 6 is an enlarged sectional elevation with the front of the casingremoved.

In the drawings like characters of reference indicate correspondingparts in the different figures.

Proceeding first to describe the hinge configuration, referencecharacter 10 illustrates one half of a butt hinge, 11 indicating thehinge line and it will be understood that both halves are similar.

The rear side 12 of this hinge plate is provided with a perimetricalconfiguration comprising the intersecting arcs 13, 14 and 15 of threecircles having similar radii and this hinge plate 1G is shown in dottedline in FGURE 1. The solid lines 16, 17 and 18 define the boundaries ofthe intersecting recesses formed by the drilling device so that thehinge plate nests within the formed recess and may be screwed therein.

FIGURE 2 shows an alternative configuration of a hinge plate 19 in whichthe ends 20 of the rear edge are arcs of circles having similar radii,the edge 21 being straight and tangental to these arcs. If thisconstruction of hinge plate is utilized, then the portions shown incross hatch in FIGURE 2 and identified by the reference character 22have to be chiselled out after the recesses are formed. Once again thehinge plate nest-s within the formed recess and may be screwed thereto.

The device collectively designated 23 is utilized to form the recessesin the door jamb or door edge 24 hereinbefore described.

In detail, it consists of a guide casing collectively designated 25having a front wall 26, end walls 27 and a rear wall (not illustrated)all of which form a hollow substantially rectangular configuratedcasing.

The upper side 2S of this casing is open and the lower side 2'9 isprovided with a centrally located opening 30 having ends 31 which arearcs of circles of equal radii and sides 32 which are tangential tothese arcs (see FIGURE 5). Situated within this casing is a drillassembly collectively designated 33. This drill assembly is carried by aframe consisting of a substantially rectangular upper plate 34 and asimilar lower plate 35, said plate being maintained in spaced andparallel relationship by means of sides 36, the plates 34 and 35 and thesides 36 being secured together to form an integral unit.

This integral unit is adapted to reciprocate vertically within the guidecasing 23 and springs 37 react between the lower plate 35 and the lowerside 29 of the guide casing and normally maintain the drill assembly 33in the uppermost position shown in FIGURE 6.

A main drive shaft 38 is journalled for rotation vertically withinbearings 39 -upon plates 34 and 3S and a pair of secondary drive shafts40 are also journalled for vertical rotation within plates 34 yand 35,bearings 39 being provided for this purpose so that the three shafts arein spaced and parallel relationship, there being a secondary shaft 40upon each side of the main shaft 38.

Gears 41 are secured to the shafts and engage one another so thatrotation of the main drive shaft 38 also rotates the secondary `driveshafts 40.

Secured to the lower ends 42 of the secondary drive shafts and to thelower end 43 of the main drive shaft are blade type cutters 44. Thesecutters are vertically situated planar strips having sharpened loweredges 45, central guide points 46, and outer perimeter cutters 47. Whenthe cutter element 44 secured to the main drive shaft 38 iS aligned withthe longitudinal axis of the device as shown in FIGURE 6, the cutters 44secured to the secondary shafts 40 are situated at right angles thereto.The shafts 40 are situated so that the radii of action of the cutterelements overlap one another as shown in dotted line in FIGURE 5,reference character 47 indicating this overlapping relationship and itis this overlapping relationship which gives the required overlappingrelationship of the circular recesses; formed within the door edge 24 orthe door jamb (not illustrated).

In operation, a hand drill or electric drill (not illustrated) issecured to the extending portion 48 of the main drive shaft and thecasing is placed upon the edge of the door 24. In this connection adownwardly extending lian ge 49 is for-med as an extension of the rearwall of the casing 4and this ange engages the side 50 of the door thuspositioning the cutters in the correct relationship.

The source of power is caused to rotate the drive shaft 38 and the gearsrotate the secondary shafts 40. Downward pressure is applied to theshaft 38 by the source of power thus moving the entire drill assembly 33downwardly against pressure of springs 37 so that the cutters 44 extendbelow the lower side 29 of the casing and engage the edge of the door.The rotating drills cut the recesses and continued downward pressurecauses the drill assembly to move downwardly until adjustable stops 51extending from the lower plate 35, strike the ybottom plate 29 of thecasing. Depending upon the adjustment of these stops 5I, the depth ofthe recesses cut by the cutters is controlled.

As soon as the pressure is released, springs 37 return the drillassembly to the uppermost position shown in FIGURE 6 with the cutterelements 44 shrouded by the bottom plate 29 and thus in a safecondition.

It is desirable that the width of the ends 27 of the casing :be suchthat the lower side 51 of the front of the casing is engageable with thedoor jamb stop strip (not illustrated) which also positions the cuttersin the correct position.

It will therefore be seen that the device can be utilized to cut boththe recesses within the edge of the door and within the door jamb withno measurements being required except for vertical positioning.

Since various modifications can be made to the invention hereindescribed within the scope of the inventive concept disclosed, it is notintended that protection of the said invention should be interpreted asrestricted to the modication or modifications or known parts of suchconcept as have been particularly described, defined, or exemplied,since this disclosure is intended to explain the construction andoperation of such concept, and not for the pur-pose of limitingprotection to any specific embodiment or details thereof.

What I claim as my invention is:

1. In a recessing device for hinge plates, the combination of anelongated casing including a bottom wall formed with an elongatedopening, a guide ange .rigid with said casing and projecting downwardlybelow said bottom wall for coaction with the bottom wall in locatingsaid casing on a piece of work, -a frame slidably positioned in saidcasing for raising and lowering movement relative to the casing,compression springs reacting between said frame and said bottom wall forbiasing the frame to its raised position, a set of vertical shaftsrotatably mounted in said frame and geared together for simultaneousrotation, a set of cutters secured to the lower ends of the respectiveshafts and having work engaging lower cutting edges disposed in a commonplane, and vertically adjustable stop elements depending from said frameand engageable with said bottom wall, said cutters being disposed insaid casing when said frame is in its raised position but beingprojectable downwardly through said bottom wall opening to apredetermined extent with respect to said bottom wall as limited byengagement of said stop elements with the bottorn wall when said frameis lowered.

References Cited UNITED STATES PATENTS 393,817 12/1888 Clapp 14s- 60.5513,088 1/1894 Crane 14S-60.5 2,234,789 3/ 1941 Wunderlich 7 7-22 XRFOREIGN PATENTS 99,656 8/1940 Sweden.

FRANCIS S. HUSAR, Primary Examiner.

